0.45 µm pore size, 25 mm diameter, Millex-LCR hydrophilic PTFE membrane with glass fiber prefilter, domed housing. Millipore. pricing. SLLGM25. 0.20 µm pore size, 25 mm diameter, Millex-LCR hydrophilic PTFE membrane with glass fiber prefilter, domed housing.